Figure 6.37 shows a venturi meter with a U-tube manometer to measure the velocity of flow. When no flow occurs, the mercury column is balanced and its top is 300 mm below throat. Compute the volume flow rate through the meter that will cause the mercury to flow into the through. Note that for a given manometer deflection h, the left side will move down h/2 and the right side would rise h/2.

Figure 6.37

D, - 75-mm diameter D,- 25-mm inside diameter - Flow Water 300 mm with no flow Mercury - sg = 13.54